All classes of fires can be safely combated using（）

单项选择题If there were a fire in the bunker tanks, you would（）

A.close the vent
B.pump out the tank
C.activate the fixed CO₂ system
D.cut off the heating coils

单项选择题Any friction fit, tightness or adhesion of the part of any load being lifted should be broken by wedge or tapping and not by increasing the load on the applianceAccording to this sentence, （）

A.the lifting appliance can always lift the freight within its rated load
B.attention should be paid in order not to break the wedge when lifting cargo
C.sometimes the lifting work needs other assistance other than the lifting appliance
D.lifting work should be done with every part fit, tightness or adhesion

单项选择题In order to remove the carbon deposit from the threaded recess, we can use（）

A.a driver
B.a scraper
C.a tap
D.a file

单项选择题Waste oil should（）

A.be treated according to the C-Es command exactly
B.be treated according to MARPOL
C.accumulate in bilges or on tank tops in accordance with MARPOL
D.discharge to sea at the specified areas

单项选择题All items such as steam pipes, exhaust pipes and fittings which, because of their location and operating temperature, present a hazard should be adequately lagged.That means the items should（）

A.not be put into operation too early
B.be pay adequate attention to
C.be used only when necessary
D.be coated with certain material